From patchwork Tue Feb 11 19:39:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 11376815 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C766492A for ; Tue, 11 Feb 2020 19:37:38 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E239820842 for ; Tue, 11 Feb 2020 19:37:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="MneCRC+q"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="LEUl6BRs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E239820842 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=embeddedor.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id B6DA983B; Tue, 11 Feb 2020 20:36:52 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz B6DA983B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1581449855; bh=KI5mGiCcqd2xg8tF0vuIyjehm5dWQ0ynU10Uu5z5Jbc=; h=Date:From:To:Cc:Subject:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From; b=MneCRC+qjOlvKI9+WC7Sn/y7OW3hvuvBuPajP8aHB6/Ti7Zr3fw3ccYeyuRnvMVP/ CXIeeLYdtXBJ7Uxt71NvmAaG7GPnPZkUXdQUNtCN3RcKqDAWlb6fEuZ+LreKM8Q9P2 gDCR/ol3STQ5mTk+trddG+97VbWv35zBiNxV6y2I= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 2079EF8013E; Tue, 11 Feb 2020 20:36:52 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id B476AF80145; Tue, 11 Feb 2020 20:36:49 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: X-Spam-Status: No, score=-0.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,SURBL_BLOCKED, URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from gateway20.websitewelcome.com (gateway20.websitewelcome.com [192.185.52.45]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 554A9F800F0 for ; Tue, 11 Feb 2020 20:36:45 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 554A9F800F0 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="LEUl6BRs" Received: from cm14.websitewelcome.com (cm14.websitewelcome.com [100.42.49.7]) by gateway20.websitewelcome.com (Postfix) with ESMTP id 763CF400DFBC2 for ; Tue, 11 Feb 2020 12:23:04 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 1bKnjGwYtXVkQ1bKnjfHmg; Tue, 11 Feb 2020 13:36:38 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=UM0S/XX22/eXnz8emf2UzrArwB+5xzNNImR9J+pKjzA=; b=LEUl6BRslj1G7JB0krKO9LhFO+ TtVynXO3yhi2pAvhqYjAn3QzO2D2W1urUOIBbth6z9A3oi+IbdJZLsC9GTxjLDdneqfCBiOkdgpk9 WnaAF9hp2Y7AwOgpwk9nsp7HOEJKl6j1TOuLwj/w6GKN5iqfgxrl60+SUG5d92yp5Y92rZWxxguIT mPuoBbRqyQTHUj5lXPVcTWudocAzlkJeIzKHzY8mYikjoVtDxGqY6fikZSrEIr7n2TPhhIpe2pkBB HTIOpnm1ieqm9HR2H7ge31UCcJ+modFhD5GDvUEoazAabs2X3girzdicFvbPmr6fvhwdEcT7lMeCk zKyVGjfw==; Received: from [200.68.140.36] (port=5745 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j1bKm-001Hcy-7Z; Tue, 11 Feb 2020 13:36:36 -0600 Date: Tue, 11 Feb 2020 13:39:10 -0600 From: "Gustavo A. R. Silva" To: Jaroslav Kysela , Takashi Iwai Message-ID: <20200211193910.GA4596@embeddedor> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - alsa-project.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 200.68.140.36 X-Source-L: No X-Exim-ID: 1j1bKm-001Hcy-7Z X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [200.68.140.36]:5745 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 10 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [alsa-devel] [PATCH] ALSA: core: Replace zero-length array with flexible-array member X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertenly introduced[3] to the codebase from now on. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva --- sound/core/oss/rate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/core/oss/rate.c b/sound/core/oss/rate.c index 2fa9299a440d..e9f20fefb117 100644 --- a/sound/core/oss/rate.c +++ b/sound/core/oss/rate.c @@ -47,7 +47,7 @@ struct rate_priv { unsigned int pos; rate_f func; snd_pcm_sframes_t old_src_frames, old_dst_frames; - struct rate_channel channels[0]; + struct rate_channel channels[]; }; static void rate_init(struct snd_pcm_plugin *plugin)